zsh:funcs:mkcd: Prevent recursion with command

Call the external command `mkdir` to prevent recursion through the alias
added in 7834a6bee2 ("zsh:alias: Alias `mkdir` to `mkcd`").

.config/zsh/zshrc.d/40-functions.zsh

@@ -23,7 +23,7 @@ bwpwd() {
 # mkdir wrapper that changes into the created directory if only one was given
 mkcd () {
 	# Create directory
-	mkdir "$@" || return
+	command mkdir "$@" || return
 
 	# Remove flags and their arguments
 	nargs="$#"